SAA7806H NXP [NXP Semiconductors], SAA7806H Datasheet - Page 50
SAA7806H
Manufacturer Part Number
SAA7806H
Description
One chip automotive CD audio device
Manufacturer
NXP [NXP Semiconductors]
Datasheet
1.SAA7806H.pdf
(73 pages)
- Current page: 50 of 73
- Download datasheet (349Kb)
Philips Semiconductors
9397 750 13697
Objective data sheet
6.7.4.2 Focus position control loop
When focus is achieved and the level on the FE
enabled to switch on when the next zero crossing is detected in the FE
The focus control loop contains a digital PID controller which has 5 parameters that are
available to the user. These coefficients influence the integrating (foc_int), proportional
(foc_lead_length, part of foc_parm3) and differentiating (foc_pole_lead, part of
foc_parm1) action of the PID and a digital low-pass filter (foc_pole_noise, part of
foc_parm2) following the PID. The fifth coefficient foc_gain influences the loop gain.
Figure 30
determine the behavior.
A simplified block diagram of the focus PID system is given in
By using a zero error signal, the actuator position can be held. This action is taken if a
defect or shock is encountered. The PID is followed by a low-pass filter to reduce audible
noise in the control loop.
The desired frequencies for the loop (
Full tables are given in the Hardware Software Interface (HSI) specification . An
explanation of the parameters in these diagrams is given in
Fig 30. Bode diagram of focus PID system
Fig 31. Functional diagram of focus PID system
focus error,
FE
zero on
defect
or shock
n
Amplitude
foc_gain
(dB)
shows the transfer function of the controller, and the coefficients which
foc_int_strength
5
P
I
D
Rev. 01 — 20 June 2005
I
1/j
foc_int
1
1 j /
1
j /
P
1
3
3
to
foc_lead_length
4
2
) are used to calculate the coefficient values.
D
2
n
/
foc_pole_lead
One chip automotive CD audio device
signal is reached, the focus PID is
3
3
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
foc_pole_noise
Table
Figure
4
12.
4
31.
SAA7806
n
G
signal.
68 FO
Frequency
001aab773
G
(log Hz)
E
001aab774
actuator
50 of 73
focus
Related parts for SAA7806H
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
NXP Semiconductors designed the LPC2420/2460 microcontroller around a 16-bit/32-bitARM7TDMI-S CPU core with real-time debug interfaces that include both JTAG andembedded trace
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
NXP Semiconductors designed the LPC2458 microcontroller around a 16-bit/32-bitARM7TDMI-S CPU core with real-time debug interfaces that include both JTAG andembedded trace
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
NXP Semiconductors designed the LPC2468 microcontroller around a 16-bit/32-bitARM7TDMI-S CPU core with real-time debug interfaces that include both JTAG andembedded trace
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
NXP Semiconductors designed the LPC2470 microcontroller, powered by theARM7TDMI-S core, to be a highly integrated microcontroller for a wide range ofapplications that require advanced communications and high quality graphic displays
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
NXP Semiconductors designed the LPC2478 microcontroller, powered by theARM7TDMI-S core, to be a highly integrated microcontroller for a wide range ofapplications that require advanced communications and high quality graphic displays
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
The NXP BlueStreak LH75401/LH75411 family consists of two low-cost 16/32-bit System-on-Chip (SoC) devices
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
The NXP LPC3130/3131 combine an 180 MHz ARM926EJ-S CPU core, high-speed USB2
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
The NXP LPC3141 combine a 270 MHz ARM926EJ-S CPU core, High-speed USB 2
Manufacturer:
NXP Semiconductors
Part Number:
Description:
The NXP LPC3143 combine a 270 MHz ARM926EJ-S CPU core, High-speed USB 2
Manufacturer:
NXP Semiconductors
Part Number:
Description:
The NXP LPC3152 combines an 180 MHz ARM926EJ-S CPU core, High-speed USB 2
Manufacturer:
NXP Semiconductors
Part Number:
Description:
The NXP LPC3154 combines an 180 MHz ARM926EJ-S CPU core, High-speed USB 2
Manufacturer:
NXP Semiconductors
Part Number:
Description:
Standard level N-channel enhancement mode Field-Effect Transistor (FET) in a plastic package using NXP High-Performance Automotive (HPA) TrenchMOS technology
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
Standard level N-channel enhancement mode Field-Effect Transistor (FET) in a plastic package using NXP High-Performance Automotive (HPA) TrenchMOS technology
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
Standard level N-channel enhancement mode Field-Effect Transistor (FET) in a plastic package using NXP High-Performance Automotive (HPA) TrenchMOS technology
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
Standard level N-channel enhancement mode Field-Effect Transistor (FET) in a plastic package using NXP High-Performance Automotive (HPA) TrenchMOS technology
Manufacturer:
NXP Semiconductors
Datasheet: